﻿using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.IO;
using System.Collections;
using System.Windows.Forms.VisualStyles;

namespace Imag_writer
{
    /// <summary>  
    /// 水印的类型  
    /// </summary>  
    public enum WaterMarkType
    {
        /// <summary>  
        /// 文字水印  
        /// </summary>  
        TextMark,
        /// <summary>  
        /// 图片水印  
        /// </summary>  
        ImageMark // 暂时只能添加文字水印  
    }

    /// <summary>  
    /// 水印的位置  
    /// </summary>  
    public enum WaterMarkPosition
    {
        /// <summary>  
        /// 左上角  
        /// </summary>  
        WMP_Left_Top,
        /// <summary>  
        /// 左下角  
        /// </summary>  
        WMP_Left_Bottom,
        /// <summary>  
        /// 右上角  
        /// </summary>  
        WMP_Right_Top,
        /// <summary>  
        /// 右下角  
        /// </summary>  
        WMP_Right_Bottom
    }

    public class ImageWaterMark
    {
                public ImageWaterMark()  
        {  
            //  
            // TODO: 在此处添加构造函数逻辑  
            //  
        }  
        /// <summary>  
        /// 添加水印(分图片水印与文字水印两种)  
        /// </summary>  
        /// <param name="oldpath">原图片绝对地址</param>  
        /// <param name="newpath">新图片放置的绝对地址(不可与原图片名相同)</param>  
        /// <param name="wmtType">要添加的水印的类型</param>  
        /// <param name="sWaterMarkContent">水印内容，此即为要添加的文字</param>  
        public void AddWaterMarkText(Image pImage, string newpath, WaterMarkType wmtType, string sWaterMarkContent)  
        {  
            try  
            {  
                //Image pImage = Image.FromFile(oldpath);  
                Bitmap b = new Bitmap(pImage.Width, pImage.Height,PixelFormat.Format24bppRgb);  
                Graphics g = Graphics.FromImage(b);  
                g.Clear(Color.White);  
                g.SmoothingMode = SmoothingMode.HighQuality;  
                g.InterpolationMode = InterpolationMode.High;  
                g.DrawImage(pImage, 0, 0, pImage.Width, pImage.Height);  
                switch (wmtType)  
                {  
                    /**/  
                    /*case WaterMarkType.ImageMark: 
                    //图片水印 
                    this.addWatermarkImage(g,  
                        Page.Server.MapPath(Watermarkimgpath),  
                        WatermarkPosition,image.Width,image.Height); 
                    break;*/  
                    case WaterMarkType.TextMark:  
                        //文字水印  
                        this.addWatermarkText(g, sWaterMarkContent, "WM_BOTTOM_RIGHT",  
                            pImage.Width, pImage.Height);  
                        break;  
                }  
                b.Save(newpath);  
                b.Dispose();  
                pImage.Dispose();  
            }  
            catch  
            {  
                //if (File.Exists(oldpath))  
                //{  
                //    //File.Delete(oldpath);  
                //}  
            }  
            finally  
            {  
                //if (File.Exists(oldpath))  
                //{  
                //    // File.Delete(oldpath);  
                //}  
            }  
        }  
  
  
  
//--------------------------------------------------------------------------------------  
        ///  <summary>   
        /// 在图片上生成图片水印   
        ///  </summary>   
        ///  <param name="Path">原服务器图片路径 </param>   
        ///  <param name="Path_syp">生成的带图片水印的图片路径 </param>   
        ///  <param name="Path_sypf">水印图片路径 </param>   
        public void AddWaterPic(string Path, string Path_syp, string Path_sypf)  
        {  
            Image image = Image.FromFile(Path);  
            Image copyImage = Image.FromFile(Path_sypf);  
            Graphics g = Graphics.FromImage(image);  
            Rectangle rect = new Rectangle(image.Width - copyImage.Width, image.Height - copyImage.Height, copyImage.Width, copyImage.Height);  
            g.DrawImage(copyImage, rect, 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);  
            g.Dispose();  
            image.Save(Path_syp);  
            image.Dispose();  
        }  
  
       // 给图片加水印#region 给图片加水印  
        /// <summary>  
        /// 添加水印(分图片水印与文字水印两种)  
        /// </summary>  
        /// <param name="oldpath">原图片绝对地址</param>  
        /// <param name="newpath">新图片放置的绝对地址(不可与原图片名相同)</param>  
        /// <param name="wmtType">要添加的水印的类型</param>  
        /// <param name="sWaterMarkContent">水印内容，若添加文字水印，此即为要添加的文字；  
        /// 若要添加图片水印，此为图片的路径(图片水印暂不可用)</param>  
        public void addWaterMark(string oldpath, string newpath,   
            WaterMarkType wmtType, string sWaterMarkContent)  
        {  
            try  
            {  
                Image image = Image.FromFile(oldpath);  
                Bitmap b = new Bitmap(image.Width, image.Height,   
                    PixelFormat.Format24bppRgb);  
                Graphics g = Graphics.FromImage(b);  
                g.Clear(Color.White);  
                g.SmoothingMode = SmoothingMode.HighQuality;  
                g.InterpolationMode = InterpolationMode.High;  
                g.DrawImage(image, 0, 0, image.Width, image.Height);  



                switch (wmtType)  
                {  
                    /**/
                    case WaterMarkType.ImageMark: 
                        //图片水印 
                        //this.addWatermarkImage(g,
                        //    Page.Server.MapPath(Watermarkimgpath),  
                        //    WatermarkPosition,image.Width,image.Height); 
                        break; 
                    case WaterMarkType.TextMark:  
                        //文字水印  
                        this.addWatermarkText(g, sWaterMarkContent, "WM_BOTTOM_RIGHT",   
                            image.Width, image.Height);  
                        break;  
                }  
                b.Save(newpath);  
                b.Dispose();  
                image.Dispose();  
            }  
            catch  
            {  
                if(File.Exists(oldpath))  
                {  
                    //File.Delete(oldpath);  
                }  
            }  
            finally  
            {  
                if(File.Exists(oldpath))  
                {  
                   // File.Delete(oldpath);  
                }  
            }    
        }  
        /**//// <summary>  
        ///  加水印文字  
        /// </summary>  
        /// <param name="picture">imge 对象</param>  
        /// <param name="_watermarkText">水印文字内容</param>  
        /// <param name="_watermarkPosition">水印位置</param>  
        /// <param name="_width">被加水印图片的宽</param>  
        /// <param name="_height">被加水印图片的高</param>  
        private void addWatermarkText(Graphics picture, string _watermarkText,   
            string _watermarkPosition, int _width, int _height)  
        {  
            // 确定水印文字的字体大小  
            int[] sizes = new int[]{58,50,40,36, 32,30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4};  
            Font crFont = null;  
            SizeF crSize = new SizeF();  
            for (int i = 0;i < sizes.Length; i++)  
            {  
                //crFont = new Font("Arial Black", sizes[i], FontStyle.Regular);  
                crFont = new Font("ＭＳ ゴシック", sizes[i], FontStyle.Regular);  
                crSize = picture.MeasureString(_watermarkText, crFont);  
                if((ushort)crSize.Width < (ushort)_width)  
                {  
                    break;  
                }  
            }  
            // 生成水印图片（将文字写到图片中）  
            Bitmap floatBmp = new Bitmap((int)crSize.Width + 15,   
                           (int)crSize.Height+50, PixelFormat.Format32bppArgb);  
            Graphics fg=Graphics.FromImage(floatBmp);  
            PointF pt=new PointF(10,35);  
            // 画阴影文字  
            //Brush TransparentBrush0 = new SolidBrush(Color.FromArgb(255, Color.Black));  
            //Brush TransparentBrush1 = new SolidBrush(Color.FromArgb(255, Color.Black));  
            //fg.DrawString(_watermarkText,crFont,TransparentBrush0, pt.X, pt.Y + 1);   
            //fg.DrawString(_watermarkText,crFont,TransparentBrush0, pt.X + 1, pt.Y);   
            //fg.DrawString(_watermarkText,crFont,TransparentBrush1, pt.X + 1, pt.Y + 1);   
            //fg.DrawString(_watermarkText,crFont,TransparentBrush1, pt.X, pt.Y + 2);   
            //fg.DrawString(_watermarkText,crFont,TransparentBrush1, pt.X + 2, pt.Y);   
            //TransparentBrush0.Dispose();   
            //TransparentBrush1.Dispose();  


            fg.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            //背景涂白，遮挡原图噪点
            fg.FillRectangle(Brushes.White, 0, 0, floatBmp.Width, floatBmp.Height);
            
            // 画文字  
            fg.DrawString(_watermarkText,
                crFont, Brushes.Black,
                pt.X, pt.Y, StringFormat.GenericDefault);

            // 保存刚才的操作  
            fg.Save();   
            fg.Dispose();  

            // 将水印图片加到原图中  
            this.addWatermarkImage(  
                picture,   
                new Bitmap(floatBmp),   
                "WM_BOTTOM_RIGHT",   
                _width,   
                _height);  
        }  
        /**//// <summary>  
        ///  加水印图片  
        /// </summary>  
        /// <param name="picture">imge 对象</param>  
        /// <param name="iTheImage">Image对象（以此图片为水印）</param>  
        /// <param name="_watermarkPosition">水印位置</param>  
        /// <param name="_width">被加水印图片的宽</param>  
        /// <param name="_height">被加水印图片的高</param>  
        private void addWatermarkImage( Graphics picture,Image iTheImage,   
            string _watermarkPosition,int _width,int _height)  
        {  
            Image watermark = new Bitmap(iTheImage);  
   
            ImageAttributes imageAttributes = new ImageAttributes();  
            ColorMap colorMap = new ColorMap();  
            colorMap.OldColor = Color.FromArgb(0, 0, 0, 0);  
            colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);  
            ColorMap[] remapTable = {colorMap};  
            imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);  
            float[][] colorMatrixElements = {  
                                                new float[] {1.0f, 0.0f, 0.0f, 0.0f, 0.0f},  
                                                new float[] {0.0f, 1.0f, 0.0f, 0.0f, 0.0f},  
                                                new float[] {0.0f, 0.0f, 1.0f, 0.0f, 0.0f},  
                                                new float[] {0.0f, 0.0f, 0.0f, 1.0f, 0.0f},  
                                                new float[] {0.0f, 0.0f, 0.0f, 0.0f, 1.0f}   
                                            };  
   
            ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);  
   
            imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);  
            int xpos = 0;  
            int ypos = 0;  
            int WatermarkWidth = 0;  
            int WatermarkHeight = 0;  
            double bl = 1d;  
            //计算水印图片的比率  
            //取背景的1/4宽度来比较  
            if ((_width > watermark.Width * 4) && (_height > watermark.Height * 4))  
            {  
                bl = 1;  
            }  
            else if ((_width > watermark.Width * 4) && (_height<watermark.Height * 4))  
            {  
                bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height);  
              
            }  
            else if ((_width < watermark.Width * 4) && (_height > watermark.Height * 4))  
            {  
                bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width);  
            }  
            else  
            {  
                if ((_width * watermark.Height) > (_height * watermark.Width))  
                {  
                    bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height);  
                      
                }  
                else  
                {  
                    bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width);  
                      
                }  
              
            }
            //WatermarkWidth = Convert.ToInt32(watermark.Width * bl);
            //WatermarkHeight = Convert.ToInt32(watermark.Height * bl);  
            WatermarkWidth = Convert.ToInt32(watermark.Width);  
            WatermarkHeight = Convert.ToInt32(watermark.Height*0.85);  
            switch (_watermarkPosition)  
            {  
                case "WM_TOP_LEFT":  
                    xpos = 10;  
                    ypos = 10;  
                    break;  
                case "WM_TOP_RIGHT":  
                    xpos = _width - WatermarkWidth - 10;  
                    ypos = 10;  
                    break;  
                case "WM_BOTTOM_RIGHT":  
                    xpos = _width - WatermarkWidth - 10;  
                    //ypos = _height -WatermarkHeight - 10;  
                    ypos = _height - WatermarkHeight;  
                    break;  
                case "WM_BOTTOM_LEFT":  
                    xpos = 10;  
                    ypos = _height - WatermarkHeight - 10;  
                    break;  
            }  
            picture.DrawImage(  
                watermark,   
                new Rectangle(xpos, ypos, WatermarkWidth, WatermarkHeight),   
                0,   
                0,   
                watermark.Width,   
                watermark.Height,   
                GraphicsUnit.Pixel,   
                imageAttributes);  
            watermark.Dispose();  
            imageAttributes.Dispose();  
        }  
        /**//// <summary>  
        ///  加水印图片  
        /// </summary>  
        /// <param name="picture">imge 对象</param>  
        /// <param name="WaterMarkPicPath">水印图片的地址</param>  
        /// <param name="_watermarkPosition">水印位置</param>  
        /// <param name="_width">被加水印图片的宽</param>  
        /// <param name="_height">被加水印图片的高</param>  
        private void addWatermarkImage( Graphics picture,string WaterMarkPicPath,   
            string _watermarkPosition,int _width,int _height)  
        {  
            Image watermark = new Bitmap(WaterMarkPicPath);  
   
            this.addWatermarkImage(picture, watermark, _watermarkPosition, _width,   
                _height);  
        }  
        //生成缩略图#region 生成缩略图  
        /**//// <summary>  
        /// 保存图片  
        /// </summary>  
        /// <param name="image">Image 对象</param>  
        /// <param name="savePath">保存路径</param>  
        /// <param name="ici">指定格式的编解码参数</param>  
        private void SaveImage(Image image, string savePath, ImageCodecInfo ici)  
        {  
            //设置 原图片 对象的 EncoderParameters 对象  
            EncoderParameters parameters = new EncoderParameters(1);  
            parameters.Param[0] = new EncoderParameter(  
                System.Drawing.Imaging.Encoder.Quality, ((long) 90));  
            image.Save(savePath, ici, parameters);  
            parameters.Dispose();  
        }  
        /**//// <summary>  
        /// 获取图像编码解码器的所有相关信息  
        /// </summary>  
        /// <param name="mimeType">包含编码解码器的多用途网际邮件扩充协议 (MIME) 类型的字符串</param>  
        /// <returns>返回图像编码解码器的所有相关信息</returns>  
        private ImageCodecInfo GetCodecInfo(string mimeType)  
        {  
            ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders();  
            foreach(ImageCodecInfo ici in CodecInfo)  
            {  
                if(ici.MimeType == mimeType)  
                    return ici;  
            }  
            return null;  
        }  
        /**//// <summary>  
        /// 生成缩略图  
        /// </summary>  
        /// <param name="sourceImagePath">原图片路径(相对路径)</param>  
        /// <param name="thumbnailImagePath">生成的缩略图路径,如果为空则保存为原图片路径(相对路径)</param>  
        /// <param name="thumbnailImageWidth">缩略图的宽度（高度与按源图片比例自动生成）</param>  
        public void ToThumbnailImages(  
            string SourceImagePath,  
            string ThumbnailImagePath,  
            int ThumbnailImageWidth)  
        {  
            Hashtable htmimes = new Hashtable();  
            htmimes[".jpeg"] = "image/jpeg";  
            htmimes[".jpg"] = "image/jpeg";     
            htmimes[".png"] = "image/png";     
            htmimes[".tif"] = "image/tiff";  
            htmimes[".tiff"] = "image/tiff";  
            htmimes[".bmp"] = "image/bmp";  
            htmimes[".gif"] = "image/gif";  
            // 取得原图片的后缀  
            string sExt = SourceImagePath.Substring(  
                SourceImagePath.LastIndexOf(".")).ToLower();  
            //从 原图片 创建 Image 对象  
            Image image = Image.FromFile(SourceImagePath);    
            int num = ((ThumbnailImageWidth / 4) * 3);  
            int width = image.Width;  
            int height = image.Height;  
            //计算图片的比例  
            if ((((double) width) / ((double) height)) >= 1.3333333333333333f)  
            {  
                num = ((height * ThumbnailImageWidth) / width);  
            }  
            else  
            {  
                ThumbnailImageWidth = ((width * num) / height);  
            }  
            if ((ThumbnailImageWidth < 1) || (num < 1))  
            {  
                return;  
            }  
            //用指定的大小和格式初始化 Bitmap 类的新实例  
            Bitmap bitmap = new Bitmap(ThumbnailImageWidth, num,   
                PixelFormat.Format32bppArgb);  
            //从指定的 Image 对象创建新 Graphics 对象  
            Graphics graphics = Graphics.FromImage(bitmap);  
            //清除整个绘图面并以透明背景色填充  
            graphics.Clear(Color.Transparent);  
            graphics.SmoothingMode = SmoothingMode.HighQuality;  
            graphics.InterpolationMode = InterpolationMode.High;  
            //在指定位置并且按指定大小绘制 原图片 对象  
            graphics.DrawImage(image, new Rectangle(0, 0, ThumbnailImageWidth, num));  
            image.Dispose();   
     
            try  
            {     
                //将此 原图片 以指定格式并用指定的编解码参数保存到指定文件   
                SaveImage(bitmap, ThumbnailImagePath,   
                    GetCodecInfo((string)htmimes[sExt]));  
            }  
            catch(System.Exception e)  
            {  
                throw e;  
            }  
        }  
    }  

}
